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          ORF简要解析与配置
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            <div class="post-description">ORF全称是Outbound Route Filtering，启用ORF功能，能够以最大限度减少对等路由器之间发送的BGP更新的数量。该功能可以帮助过滤减少掉不必要的路由更新，以及源路由更新的生成和处理所需的资源量。</div>

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<p>​    ORF全称是Outbound Route Filtering，启用ORF功能，能够以最大限度减少对等路由器之间发送的BGP更新的数量。该功能可以帮助过滤减少掉不必要的路由更新，以及源路由更新的生成和处理所需的资源量。</p>
<h4 id="BGP-出口路由过滤的前提条件"><a href="#BGP-出口路由过滤的前提条件" class="headerlink" title="BGP 出口路由过滤的前提条件"></a>BGP 出口路由过滤的前提条件</h4><p>​    路由器能够接收或者发送ORF公告、BGP出口路由过滤功能启用前，BGP对等会话必须建立和运行。</p>
<h4 id="ORF简要解析"><a href="#ORF简要解析" class="headerlink" title="ORF简要解析"></a>ORF简要解析</h4><p>​    ORF 实际上是借助 prefix-list 去实现路由过滤的一个特性。BGP 通过ORF公告，将本地的prefix-list 推送给对端，让对端来执行路由前缀过滤。</p>
<p>​    一旦部署了ORF，那么BGP 对等体之间在建立BGP邻居关系时，在Open消息里就会去进行ORF能力协商，如果协商成功，那么就是用Route-Refresh报文推送ORF内容。</p>
<p>下图是协商能力参数的Open消息内容：</p>
<p><img src="https://gitee.com/GWashitgton/Picture/raw/master/image/20200723105755.png" alt=""></p>
<p>查看推送的ORF的prefix：</p>
<p><img src="https://gitee.com/GWashitgton/Picture/raw/master/image/20200723105954.png" alt=""></p>
<h4 id="Cisco-ORF配置："><a href="#Cisco-ORF配置：" class="headerlink" title="Cisco ORF配置："></a>Cisco ORF配置：</h4><p>拓扑图如下：</p>
<p><img src="https://gitee.com/GWashitgton/Picture/raw/master/image/20200723110238.png" alt=""></p>
<p><strong>IOU1:</strong></p>
<p>E0/0地址：10.0.0.1/24</p>
<p>lo0地址: 9.0.0.0/24</p>
<p>lo1地址：8.0.0.0/24</p>
<p><strong>BGP配置如下：</strong></p>
<figure class="highlight powershell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">router bgp <span class="number">100</span></span><br><span class="line"> bgp log<span class="literal">-neighbor</span><span class="literal">-changes</span></span><br><span class="line"> neighbor <span class="number">10.0</span>.<span class="number">0.2</span> remote<span class="operator">-as</span> <span class="number">100</span></span><br><span class="line"></span><br><span class="line"> address<span class="literal">-family</span> ipv4</span><br><span class="line">  network <span class="number">8.0</span>.<span class="number">0.0</span> mask <span class="number">255.255</span>.<span class="number">255.0</span></span><br><span class="line">  network <span class="number">9.0</span>.<span class="number">0.0</span> mask <span class="number">255.255</span>.<span class="number">255.0</span></span><br><span class="line">  neighbor <span class="number">10.0</span>.<span class="number">0.2</span> activate</span><br><span class="line">  neighbor <span class="number">10.0</span>.<span class="number">0.2</span> capability orf prefix<span class="literal">-list</span> receive</span><br><span class="line"> <span class="built_in">exit-address</span><span class="literal">-family</span></span><br></pre></td></tr></table></figure>

<p><strong>IOU2：</strong></p>
<p>E0/0地址：10.0.0.2/24</p>
<p>Prefix-List 配置：<code>ip prefix-list 10 seq 5 permit 8.0.0.0/24</code></p>
<p><strong>BGP配置如下:</strong></p>
<figure class="highlight routeros"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">router<span class="built_in"> bgp </span>100</span><br><span class="line"><span class="built_in"> bgp </span>log-neighbor-changes</span><br><span class="line"><span class="built_in"> neighbor </span>10.0.0.1 remote-as 100</span><br><span class="line"> </span><br><span class="line"> address-family ipv4</span><br><span class="line"> <span class="built_in"> neighbor </span>10.0.0.1 activate</span><br><span class="line"> <span class="built_in"> neighbor </span>10.0.0.1 capability orf prefix-list send</span><br><span class="line"> <span class="built_in"> neighbor </span>10.0.0.1 prefix-list 10 <span class="keyword">in</span></span><br><span class="line"> exit-address-family</span><br></pre></td></tr></table></figure>

<p><strong>说明：</strong></p>
<p><strong>1. neighbor [对端地址]  capability orf prefix-list [send|receive] 启用ORF特性，并配置接收prefix-list还是发送prefix-list</strong></p>
<p><strong>2.  neighbor [对端地址] prefix-list [prefix-list-num] in 将本地prefix-list 发送到对端，从对端进行过滤。</strong></p>
<p>结果如下：</p>
<p><img src="https://gitee.com/GWashitgton/Picture/raw/master/image/20200723111103.png" alt=""></p>
<p><strong>只接收到了8.0.0.0/24的路由。</strong></p>

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        <div style="text-align:center;color: #ccc;font-size:14px;">-------------本文结束<i class="fa fa-paw"></i>感谢您的阅读-------------</div>
    
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  <p><span>本文标题:</span><a href="/2020/07/23/ORF%E7%AE%80%E8%A6%81%E8%A7%A3%E6%9E%90%E4%B8%8E%E9%85%8D%E7%BD%AE/">ORF简要解析与配置</a></p>
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  <p><span>发布时间:</span>2020年07月23日 - 11:07</p>
  <p><span>最后更新:</span>2020年07月23日 - 11:07</p>
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